I made this when I couldn't find a suitable LM8UU replacement for these bushings on the Y-plate: http://www.thingiverse.com/thing:8282
So I took GregFrost's LM8UU holder and added tabs with screw cutouts so that I could mount it using the current holes. However, I made it parametric so that users could adjust it for whatever width / size screw required.
There are also slots for zip-ties so they don't interfere with mounting.
Adjust the drill_distance, drill_size, and thickness (tab_thick) and render-skein-print!